linux-kernel - Re: [PATCH] net: dsa: b53: mmap: fix device tree support

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Date:   Wed, 15 Mar 2023 11:29:02 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Jakub Kicinski <kuba@...nel.org>,
        Álvaro Fernández Rojas <noltari@...il.com>
Cc:     jonas.gorski@...il.com, andrew@...n.ch, olteanv@...il.com,
        davem@...emloft.net, edumazet@...gle.com, pabeni@...hat.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: dsa: b53: mmap: fix device tree support

On 3/15/23 00:06, Jakub Kicinski wrote:
> On Fri, 10 Mar 2023 13:10:59 +0100 Álvaro Fernández Rojas wrote:
>> diff --git a/drivers/net/dsa/b53/b53_mmap.c b/drivers/net/dsa/b53/b53_mmap.c
>> index e968322dfbf0..24ea2e19dfa6 100644
>> --- a/drivers/net/dsa/b53/b53_mmap.c
>> +++ b/drivers/net/dsa/b53/b53_mmap.c
>> @@ -263,7 +263,7 @@ static int b53_mmap_probe_of(struct platform_device *pdev,
>>   		if (of_property_read_u32(of_port, "reg", &reg))
>>   			continue;
>>   
>> -		if (reg < B53_CPU_PORT)
>> +		if (reg <= B53_CPU_PORT)
>>   			pdata->enabled_ports |= BIT(reg);
> 
> Should we switch to B53_N_PORTS instead?
> That's the bound used by the local "for each port" macro:
> 
> #define b53_for_each_port(dev, i) \
>          for (i = 0; i < B53_N_PORTS; i++) \
>                  if (dev->enabled_ports & BIT(i))

Yes, checking against B53_N_PORTS would be a better check.
-- 
Florian